Reading Properties File MCQ

 MCQs on Reading Properties File

Which Java class is used to read properties from a properties file?

a) java.util.Properties

b) java.io.FileReader

c) java.util.Map

d) java.io.BufferedReader

Answer: a) java.util.Properties

Which method of the Properties class is used to load properties from a file?

a) load()

b) read()

c) import()

d) initialize()

Answer: a) load()

What is the correct way to create a Properties object and load properties from a file named config.properties?

a)

Properties properties = new Properties();

properties.load(new FileInputStream("config.properties"));

b)

Properties properties = new Properties();

properties.read(new FileInputStream("config.properties"));

c)

Properties properties = new Properties();

properties.load(new File("config.properties"));

d)

Properties properties = new Properties();

properties.load(new FileReader("config.properties"));

Answer: a)

Properties properties = new Properties();

properties.load(new FileInputStream("config.properties"));

How do you access a property value from a Properties object using a key?

a) properties.get(key)

b) properties.getProperty(key)

c) properties.find(key)

d) properties.getValue(key)

Answer: b) properties.getProperty(key)

Which of the following is a correct way to handle exceptions when loading properties from a file?

a) try { properties.load(new FileInputStream("config.properties")); } catch (Exception e) { e.printStackTrace(); }

b) try { properties.load(new File("config.properties")); } catch (IOException e) { e.printStackTrace(); }

c) try { properties.load(new FileReader("config.properties")); } catch (IOException e) { e.printStackTrace(); }

d) try { properties.read(new FileInputStream("config.properties")); } catch (FileNotFoundException e) { e.printStackTrace(); }

Answer: a) try { properties.load(new FileInputStream("config.properties")); } catch (Exception e) { e.printStackTrace(); }

What will the properties.getProperty("key") method return if the key does not exist in the properties file?

a) null

b) "" (empty string)

c) 0

d) default value

Answer: a) null

Which of the following is the correct way to set a property value in a Properties object?

a) properties.setProperty("key", "value");

b) properties.addProperty("key", "value");

c) properties.put("key", "value");

d) properties.putProperty("key", "value");

Answer: a) properties.setProperty("key", "value");

How can you check if a Properties object contains a specific key?

a) properties.containsKey("key")

b) properties.hasKey("key")

c) properties.keyExists("key")

d) properties.keyPresent("key")

Answer: a) properties.containsKey("key")

Which method will list all the property names in a Properties object?

a) properties.list()

b) properties.propertyNames()

c) properties.keys()

d) properties.getAllKeys()

Answer: b) properties.propertyNames()

How can you load properties from a file located in a directory relative to the project's root directory?

a) properties.load(new FileInputStream("relative/path/to/config.properties"));

b) properties.load(new FileInputStream("config.properties"));

c) properties.load(new File("relative/path/to/config.properties"));

d) properties.load(new ClassPathResource("relative/path/to/config.properties").getInputStream());

Answer: a) properties.load(new FileInputStream("relative/path/to/config.properties"));

Which class provides a utility method for reading and writing properties in a file?

a) java.util.Properties

b) java.io.File

c) java.nio.file.Files

d) java.util.Map

Answer: a) java.util.Properties